Typewriter carbon paper ribbon feeding device



H. KAMP Jan. 13, 1959 TYPEWRITER CARBON PAPER RIBBON FEEDING DEVICEFiled May 8, 1956 United States TYPEWRITER CARBON rAPER RIBBoN FEEDINGnEvrcE Hans Kamp, 'Wilhelmshavem Germany, assignor to Olympia Werke A.G., Wilhelmshaven, Germany This invention relates generally to a ribbonfeeding device for typewriters, and' more particularly to a feedingdevice for carbon paper ribbons which is actuated by the typewriterribbon reversing mechanism. The invention is particularly characterizedin that` the carbon paper ribbon feeding device utilizes an endlessrubber belt driven at one end by a pulley mounted on the shaft of thestandard take-up reel and connected at the other end to a pair ofgear-connected feed rolls disposed ona. bracket of the typewriter frame.i

In order to improve the appearance of the typewritten matter it has beenproposed previously in otfice typewriters to use a ribbon of carbonpaper rather than the standard teXtile typewriter ribbon. This carbonpaper' ribbon is designed for single-use 'application as distinguishedfrom the repetitious use contemplated for textile ribbons. It is desiredthat devices for feeding the carbon ribbon be adapted for mounting onavailable typewriter models so that the conventional textile ribbon orthe carbon paper ribbon can optionally be used in typing. The supplyroll for the carbon paper ribbon is fastened laterally to the right orleft side of the typewriter casing, and the standard carbon paperribbon, led through the ribbon fork over a suitable guide mechanism7 isfed by an actuating device disposed on the other side of the carriagecasing, which actuating device cooperates with the ribbon reversingmechanism. The used carbon paper ribbon leaving the typewriter caneither be cut o-f or re-spooled by means of a suitable supplementalmechanism. t

The present invention provides an especially simple carbon paper ribbondevice of this type, mountable on any typewriter model, wherein thecarbon paper ribbon is led almost parallel to the platen without sharpdeflections so that the danger of tearing due to excessive friction iseliminated. A further advantage of the mechanism of this inventionconsists in that the known ribbon reversing lever, governing thetransport direction of the ribbon reversing device, is held by therubber belt in such a way that the actuation of the carbon ribbon isalways effected in a given direction. p

Another advantage of the invention resides in the use of a pair ofgear-connected feeding rollers driven by a rubber belt under control ofthe standard ribbon reversing lever, said rollers being urged togetherby resilient means to exert at desired pressure on the carbon paperribbon. One of the rollers' has flanges between which the other rolleris fitted so that the carbon paper ribbon cannot move laterally from itsposition between the rollers.

The invention will be described in further detail and with reference tothe accompanying drawing, in which:

Fig. l is a top plan view on the carbon paper ribbon feeding device withsupply magazine; and

Fig. 2 is a side view of the actuating mechanism.

In the drawing: p

On the lateral cover 1 of the typewriter, which per se is notillustrated in detail because it is conventional, there is removablyfastened a standard carbon paper ribbon atent p same way as in normaltypewriter ribbon feeding arrangements.

On the other side of the typewriter the-re is disposed the inventivedevice for the feeding of the carbon paper ribbon 6. On the right sidewall 7b of the frame there is rigidly fastened, as by means of screws12, a bracket 11 upon which is mounted` a pair of rollers 13, 14. Roller13 is actuated by an endless rubber belt 15 driven by pulley 17 attachedto the shaft 16 of the standard take-up i reel. Roller 13 is provided ateither side with flanges 13a between which rides the cooperating roller14. The roller 14 s rotatably mounted on a slider member 18 which isslidably fulcrumed on the lower side of bracket ll. Between the strap 11and the slider member 18, there is disposed a spring 19, which draws theslider member with the roller 14 against the upper surface of the carbonpaper ribbon riding on the rubber belt 15 and insures a desired contactpressure. Rollers 13 and 14 are geared together by gears 20 and 21.

As known, the reversing levers 22 in the ribbon reversing mechanismserve to produce a change in the transport direction of the ribbon bythe stroke applied to said lever 22 when the ribbon leaves the reel.According to the present invention, the rubber belt 15 is led along saidlever 22 in such a way that the drive between pulley 17 and roller 13 iseffected upon actuation of reversing lever 22, whereby the transport ofthe carbon paper ribbon proceeds smoothly in one direction.

The operation of the device is as follows:

The pulley 17, attached to the shaft of the standard take-up reel,rotates in a clockwise direction as shown by the arrow when thetypewriter is in operation. Roller' 13 will then be driven inpaclockwise direction by rubber belt 15. Roller 14, which is elasticallyapplied toward the roller 13, will rotate in a counter-clockwsedirection due to the connection of gears 20, 21. The carbon paper ribbon6 will be fed to the right by rollers 13 and 14, and will be withdrawnfrom the reel 3 through the ribbon fork 10 and the guide rail 8.

The mechanisrn of theiinstant invention permits an exchange of bothmotion directions so that the carbon paper ribbon can also move in areverse direction. Only an exchange of the driving members and the reelswould be required in such a case.

I claim:

l, ln a typewriter having a ribbon fork, a take-up reel mechanism, and aribbon reversing mechanism, a device for feeding carbon paper typewriterribbon through the ribbon fork comprising a pair of feed rollers fordriving the ribbon, gear means for connecting the feed rollers to eachother, and an elastic belt driven by the take-up reel mechanism uponactuation of the ribbon reversing mechanism for driving one of the feedrollers.

2. A carbon paper typewriter ribbon feeding device as defined in claim 1wherein one of said feed rollers has i flanges on either Side thereofand wherein the other feed roller is mounted at least partially withinsaid flanges.

3. A carbon paper ribbon feeding device as defined in claim 2 whereinthe ribbon reversing mechanism has a reversing lever and said elasticbelt retains said lever' in a position to maintain continuous feeding ofthe ribbon from the carbon paper ribbon reel through the ribbon fork.

Patented Jan. 13, 1959` 4. A carbon paper ribbon feeding device asdefined References Cited in the file of this patent in clam 3 `andfurther including spring means urging said UNITED STATES PATENTS feedrollers together.

5. A carbon paper ribbon feeding device as defined in 15571422 i VanBeck Jan- 24 1928 claim 4 wherein said elastic belt is positoned arounda 2702623 Pelton Feb' 22 1955 portion of the periphery of the drivenfeed roller and the i carbon paper ribbon is fed between the elasticbelt on FOREIGN ATENTS said driven feed roller and the other feedroller. 512,081 Great Britain Aug. 29, 1931

